diff options
Diffstat (limited to 'lib/kobject.c')
| -rw-r--r-- | lib/kobject.c | 93 |
1 files changed, 61 insertions, 32 deletions
diff --git a/lib/kobject.c b/lib/kobject.c index aa89edcd2b63..f2ccdbac8ed9 100644 --- a/lib/kobject.c +++ b/lib/kobject.c @@ -18,7 +18,7 @@ #include <linux/random.h> /** - * kobject_namespace - return @kobj's namespace tag + * kobject_namespace() - Return @kobj's namespace tag. * @kobj: kobject in question * * Returns namespace tag of @kobj if its parent has namespace ops enabled @@ -36,7 +36,7 @@ const void *kobject_namespace(struct kobject *kobj) } /** - * kobject_get_ownership - get sysfs ownership data for @kobj + * kobject_get_ownership() - Get sysfs ownership data for @kobj. * @kobj: kobject in question * @uid: kernel user ID for sysfs objects * @gid: kernel group ID for sysfs objects @@ -82,6 +82,7 @@ static int populate_dir(struct kobject *kobj) static int create_dir(struct kobject *kobj) { + const struct kobj_type *ktype = get_ktype(kobj); const struct kobj_ns_type_operations *ops; int error; @@ -95,6 +96,14 @@ static int create_dir(struct kobject *kobj) return error; } + if (ktype) { + error = sysfs_create_groups(kobj, ktype->default_groups); + if (error) { + sysfs_remove_dir(kobj); + return error; + } + } + /* * @kobj->sd may be deleted by an ancestor going away. Hold an * extra reference so that it stays until @kobj is gone. @@ -153,12 +162,11 @@ static void fill_kobj_path(struct kobject *kobj, char *path, int length) } /** - * kobject_get_path - generate and return the path associated with a given kobj and kset pair. - * + * kobject_get_path() - Allocate memory and fill in the path for @kobj. * @kobj: kobject in question, with which to build the path * @gfp_mask: the allocation type used to allocate the path * - * The result must be freed by the caller with kfree(). + * Return: The newly allocated memory, caller must free with kfree(). */ char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) { @@ -265,7 +273,7 @@ static int kobject_add_internal(struct kobject *kobj) } /** - * kobject_set_name_vargs - Set the name of an kobject + * kobject_set_name_vargs() - Set the name of a kobject. * @kobj: struct kobject to set the name of * @fmt: format string used to build the name * @vargs: vargs to format the string. @@ -305,7 +313,7 @@ int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, } /** - * kobject_set_name - Set the name of a kobject + * kobject_set_name() - Set the name of a kobject. * @kobj: struct kobject to set the name of * @fmt: format string used to build the name * @@ -327,7 +335,7 @@ int kobject_set_name(struct kobject *kobj, const char *fmt, ...) EXPORT_SYMBOL(kobject_set_name); /** - * kobject_init - initialize a kobject structure + * kobject_init() - Initialize a kobject structure. * @kobj: pointer to the kobject to initialize * @ktype: pointer to the ktype for this kobject. * @@ -383,7 +391,7 @@ static __printf(3, 0) int kobject_add_varg(struct kobject *kobj, } /** - * kobject_add - the main kobject add function + * kobject_add() - The main kobject add function. * @kobj: the kobject to add * @parent: pointer to the parent of the kobject. * @fmt: format to name the kobject with. @@ -397,15 +405,23 @@ static __printf(3, 0) int kobject_add_varg(struct kobject *kobj, * is assigned to the kobject, then the kobject will be located in the * root of the sysfs tree. * - * If this function returns an error, kobject_put() must be called to - * properly clean up the memory associated with the object. - * Under no instance should the kobject that is passed to this function - * be directly freed with a call to kfree(), that can leak memory. - * * Note, no "add" uevent will be created with this call, the caller should set * up all of the necessary sysfs files for the object and then call * kobject_uevent() with the UEVENT_ADD parameter to ensure that * userspace is properly notified of this kobject's creation. + * + * Return: If this function returns an error, kobject_put() must be + * called to properly clean up the memory associated with the + * object. Under no instance should the kobject that is passed + * to this function be directly freed with a call to kfree(), + * that can leak memory. + * + * If this function returns success, kobject_put() must also be called + * in order to properly clean up the memory associated with the object. + * + * In short, once this function is called, kobject_put() MUST be called + * when the use of the object is finished in order to properly free + * everything. */ int kobject_add(struct kobject *kobj, struct kobject *parent, const char *fmt, ...) @@ -431,15 +447,19 @@ int kobject_add(struct kobject *kobj, struct kobject *parent, EXPORT_SYMBOL(kobject_add); /** - * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy + * kobject_init_and_add() - Initialize a kobject structure and add it to + * the kobject hierarchy. * @kobj: pointer to the kobject to initialize * @ktype: pointer to the ktype for this kobject. * @parent: pointer to the parent of this kobject. * @fmt: the name of the kobject. * - * This function combines the call to kobject_init() and - * kobject_add(). The same type of error handling after a call to - * kobject_add() and kobject lifetime rules are the same here. + * This function combines the call to kobject_init() and kobject_add(). + * + * If this function returns an error, kobject_put() must be called to + * properly clean up the memory associated with the object. This is the + * same type of error handling after a call to kobject_add() and kobject + * lifetime rules are the same here. */ int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype, struct kobject *parent, const char *fmt, ...) @@ -458,7 +478,7 @@ int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype, EXPORT_SYMBOL_GPL(kobject_init_and_add); /** - * kobject_rename - change the name of an object + * kobject_rename() - Change the name of an object. * @kobj: object in question. * @new_name: object's new name * @@ -525,7 +545,7 @@ out: EXPORT_SYMBOL_GPL(kobject_rename); /** - * kobject_move - move object to another parent + * kobject_move() - Move object to another parent. * @kobj: object in question. * @new_parent: object's new parent (can be NULL) */ @@ -578,17 +598,26 @@ out: EXPORT_SYMBOL_GPL(kobject_move); /** - * kobject_del - unlink kobject from hierarchy. + * kobject_del() - Unlink kobject from hierarchy. * @kobj: object. + * + * This is the function that should be called to delete an object + * successfully added via kobject_add(). */ void kobject_del(struct kobject *kobj) { struct kernfs_node *sd; + const struct kobj_type *ktype; if (!kobj) return; sd = kobj->sd; + ktype = get_ktype(kobj); + + if (ktype) + sysfs_remove_groups(kobj, ktype->default_groups); + sysfs_remove_dir(kobj); sysfs_put(sd); @@ -600,7 +629,7 @@ void kobject_del(struct kobject *kobj) EXPORT_SYMBOL(kobject_del); /** - * kobject_get - increment refcount for object. + * kobject_get() - Increment refcount for object. * @kobj: object. */ struct kobject *kobject_get(struct kobject *kobj) @@ -693,7 +722,7 @@ static void kobject_release(struct kref *kref) } /** - * kobject_put - decrement refcount for object. + * kobject_put() - Decrement refcount for object. * @kobj: object. * * Decrement the refcount, and if 0, call kobject_cleanup(). @@ -722,7 +751,7 @@ static struct kobj_type dynamic_kobj_ktype = { }; /** - * kobject_create - create a struct kobject dynamically + * kobject_create() - Create a struct kobject dynamically. * * This function creates a kobject structure dynamically and sets it up * to be a "dynamic" kobject with a default release function set up. @@ -745,8 +774,8 @@ struct kobject *kobject_create(void) } /** - * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs - * + * kobject_create_and_add() - Create a struct kobject dynamically and + * register it with sysfs. * @name: the name for the kobject * @parent: the parent kobject of this kobject, if any. * @@ -777,7 +806,7 @@ struct kobject *kobject_create_and_add(const char *name, struct kobject *parent) EXPORT_SYMBOL_GPL(kobject_create_and_add); /** - * kset_init - initialize a kset for use + * kset_init() - Initialize a kset for use. * @k: kset */ void kset_init(struct kset *k) @@ -819,7 +848,7 @@ const struct sysfs_ops kobj_sysfs_ops = { EXPORT_SYMBOL_GPL(kobj_sysfs_ops); /** - * kset_register - initialize and add a kset. + * kset_register() - Initialize and add a kset. * @k: kset. */ int kset_register(struct kset *k) @@ -839,7 +868,7 @@ int kset_register(struct kset *k) EXPORT_SYMBOL(kset_register); /** - * kset_unregister - remove a kset. + * kset_unregister() - Remove a kset. * @k: kset. */ void kset_unregister(struct kset *k) @@ -852,7 +881,7 @@ void kset_unregister(struct kset *k) EXPORT_SYMBOL(kset_unregister); /** - * kset_find_obj - search for object in kset. + * kset_find_obj() - Search for object in kset. * @kset: kset we're looking in. * @name: object's name. * @@ -900,7 +929,7 @@ static struct kobj_type kset_ktype = { }; /** - * kset_create - create a struct kset dynamically + * kset_create() - Create a struct kset dynamically. * * @name: the name for the kset * @uevent_ops: a struct kset_uevent_ops for the kset @@ -944,7 +973,7 @@ static struct kset *kset_create(const char *name, } /** - * kset_create_and_add - create a struct kset dynamically and add it to sysfs + * kset_create_and_add() - Create a struct kset dynamically and add it to sysfs. * * @name: the name for the kset * @uevent_ops: a struct kset_uevent_ops for the kset |